LM64 datasheet(14/38 Pages) TI1

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LM64

SNAS207A – MAY 2004 – REVISED MARCH 2013

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Table 2. Actual vs. LM64 Remote Temperature Conversion(1)

Actual Remote Diode

LM64 Remote Diode

Binary Results in LM64 Remote

Hex Remote

Temperature,°C

Temperature Register, °C

Temperature Register

120

+104

0110 1000 0000 0000

6800h

125

+109

0110 1101 0000 0000

6D00h

126

+110

0110 1110 0000 0000

6E00h

130

+114

0111 0010 0010 0000

7200h

135

+119

0111 0111 0000 0000

7700h

140

+124

0111 1100 0000 0000

7C00h

(1)

Output is 11-bit two's complement word. LSB = 0.125 °C.

Table 3. Actual vs. Remote T_Crit Setpoint Example

Actual Remote Diode T_Crit

Remote T_CRIT

Binary Remote T_CRIT

Hex Remote T_CRIT High

Setpoint,°C

High Setpoint, °C

High Setpoint Value

Setpoint Value

126

+110

0110 1110

6Eh

Local Temperature data is represented by an 8-bit, two's complement byte with an LSB equal to 1°C:

Digital Output

Temperature

Binary

Hex

+125°C

0111 1101

+25°C

0001 1001

+1°C

0000 0001

0°C

0000 0000

−1°C

1111 1111

−25°C

1110 0111

−55°C

1100 1001

OPEN-DRAIN OUTPUTS, INPUTS, AND PULL-UP RESISTORS

The SMBDAT, ALERT, T_Crit, GPIO and PWM open-drain outputs and the GPD, TACH, and A0 inputs are

pulled-up by pull-up resistors to VDDas suggested in the table below.

Pin Name

Pin Number

Suggested Pull-up Resistor

Range

Typical

SMBCLK

1 k

Ω to 2 kΩ

1.5 k

Ω

SMBDAT

1 k

Ω to 2 kΩ

1.5 k

Ω

ALERT

1 k

Ω to 5 kΩ

3 k

Ω

T_Crit

1 k

Ω to 5 kΩ

3 k

Ω

5 k

Ω to 20 kΩ

10 k

Ω

GPIOx

1-3;18,19

5 k

Ω to 20 kΩ

10 k

Ω

GPDx

20-24

5 k

Ω to 20 kΩ

10 k

Ω

PWM

See (1)

TACH

1 k

Ω to 5 kΩ

3 k

Ω

(1)

Depends on the fan drive circuitry connected to this pin. In the absence of fan control circuitry use a 1

Ω pull-up resistor to VDD.

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